See How 16 Republican Presidential Hopefuls Are Running Now

The Outsiders: Scott Walker

After wowing an Iowa audience, the Wisconsin governor flew to Washington to attack its politicians, putting him on the verge of a breakout. Next he must prove his mastery of the issues. (Trending up.)

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The Outsiders: George Pataki

The former New York governor has embarked on a quixotic, tweet-intensive pre-campaign, but a rationale and public interest remain elusive. Having 18,000 Twitter followers gets you only so far. (Trending down.)

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The Outsiders: Rick Perry

The former Texas governor's quest to move beyond "oops" took a blow when a state judge refused to throw out his criminal indictment for abuse of power. Mug shots make lousy campaign posters. (Trending down.)

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The Outsiders: Mike Pence

A conservative star with both Washington and talk-radio polish, the Indiana governor found a way to embrace Obamacare's Medicaid expansion. He says he won't decide whether to run until the end of April. (Holding steady.)

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The Outsiders: John Kasich

The go-it-his-own-way Ohio governor has been touring the country in support of a balanced-budget amendment to the Constitution. This is not an issue that shows any sign of catching fire. (Holding steady.)

Illustration by Lon Tweeten for TIME; AP

The Establishment: Chris Christie

Squeezed by Jeb's success and New Jersey's economic drag, the governor keeps working both sides of the Atlantic. His bombast remains untested in the heartland. (Trending down.)

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The Establishment: Jeb Bush

The big beneficiary of Mitt Romney's decision to abandon a third presidential bid, the former Florida governor has dominated the early jockeying for moneymen and staff. Unknown: how he performs with voters. (Trending up.)

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The Establishment: Marco Rubio

The betting money says Bush's campaign will keep the Florida Senator from running this cycle, but he has impressed GOP bigs nonetheless. Watch for whether he bows out after this month's book tour to run for re-election instead. (Trending up.)

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The Wild Cards: Lindsey Graham

South Carolina's most colorful defense hawk wants to reclaim traditional GOP foreign policy—in which instability is usually the enemy. He also may have an ace up his sleeve: support from casino magnate Sheldon Adelson. (Trending up.)

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The Wild Cards: Carly Fiorina

The only woman in the anti-Hillary Clinton field, Fiorina has been one of the most effective critics of the former Secretary of State. But her record, both as a Senate candidate and Hewlett-Packard CEO, is...complicated. (Trending up.)

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The Wild Cards: Rand Paul

An intellect and master barb thrower, the Kentucky Senator is expanding his father's libertarian coalition. But his stumble over vaccine mandates suggests that transcending it will be harder. (Trending down.)

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The Purists: Rick Santorum

After winning the Iowa caucuses in 2012. Santorum has struggled for recognition in Round 2. Moral: you can run as a fresh face with a pickup truck only once. (Trending down.)

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The Purists: Bobby Jindal

The Louisiana governor has one reliable move: run to the right with innovative policy solutions. But he still barely registers in the polls. (Trending down.)

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The Purists: Ben Carson

A pediatric neurosurgeon with zero political experience, he basks in high early poll numbers and a massive online-fundraising ability. Is he for real? There is a difference between punditry and politics. (Holding steady.)

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The Purists: Mike Huckabee

Social conservatives' favorite former Arkansas governor has retooled himself as a culture warrior after six years at Fox News. He has a shot if he can reignite his old populist message in an economic upturn. (Holding steady.)

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The Purists: Ted Cruz

The Tea Party firebrand is a proven draw among the party's evangelical and Obama-hating grassroots. That same orthodoxy, and an inability to attract campaign staff, could limit the Texas Senator's ambitions. (Holding steady.)